An Investigation to Discover Factors That Can Affect The Resistance of a Wire
Aim
I shall be investigating factors that can affect the resistance of a
wire.
The possible variables I could choose are Length, Thickness, type of
metal, Shape, Temperature and Density of Metal.
I will choose Length because I can choose from a free range of lengths
and can get many different readings, to create a final graph at the
end of my investigation.
I will not choose thickness because the wires only come in set
thicknesses and do not go up in a uniform rate, so I would not have a
free range to choose from.
I will not chose types of metals because I only have 3 types of metal
available to me and could not develop a conclusion as I would not be
able to link the variables.
I will not choose shape as I would only be able to choose two sets of
results, straight and not straight.
I will not choose temperature as it would be very hard to measure the
temperature of a piece of metal and would be hard to keep at a certain
temperature.
I also will not choose density of metal as I do not have a range of
densities available to myself and would not have a choice.
Prediction
I predict that when the length of a wire gets longer, the resistance
will become greater.
I predict this because I know that resistance is when a flow of
electrons, (a current) flows through a wire and collides with the
metal ions that create the wire.
The more times they collide with the metal ions the less energy the
electrons have to go through the wire with so more collisions and more
energy lost. As the energy from the electrons is lost in collisions it
is gained by the metal ions. (This is then transferred into heat.)
The more resistance in a wire, the higher voltage it would have, and
lower energy the current, would have.
I also decided to use a wooden block to keep hold of the wire, because
The metal’s hardness along with its great tensile strength and ability to withstand extremely high temperatures make it ideal for use in the filaments in incandescent light bulbs, cathode-ray tubes, X-ray tubes, vacuum tube filaments, and rocke...
From this I can tell I can use 3 volts and resistance wire that is
Use fine sand paper to scrape the oxide coating from the surface of a strip of magnesium ribbon approximately 6 cm length. Cut the ribbon into small pieces, place in the crucible, and weigh the crucible, its lid, and contents.
Obtain a sample of metal that has been immersed in boiling water and place it in the cup of water.
Investigating the Resistance of a Wire The aim of this investigation is to see how the length of a wire affects its resistance. Background knowledge To make current flow through a conductor, there must be a potential difference (voltage) across it. As the current continues to flow there are certain factors which increase the resistance; Length of wire: as the length increases there will be a higher percentage of fixed atoms, therefore the electrons carrying the charge will collide more frequently, increasing the resistance Surface Area of wire- As you increase the surface area of a wire the resistance will decrease because the electrons will be able to travel by many different routes making the conduction easier. Type of conductor- If the wire is a good conductor of electricity then the resistance will be less because the electrons are able to flow through the wire avoiding as many collisions with the positive protons.
Factors Affecting the Resistance of a Wire The aim of this experiment is to investigate one factor that affect the resistance of a wire. I will do this by performing an experiment. First I will need to identify the factors that effect resistance. There are a few factors that affect the resistance, it is determined by the properties an object has.
Materials used to conduct the experiment was: magnesium, zinc, iron, copper, magnesium sulfate, zinc sulfate, iron (II) sulfate, copper sulfate, 16x100ml beaker, 20ml measuring cylinder and magnifying glasses.
5.7. Name the four alloying elements that have the greatest effect on the properties of steels.
Use higher manganese content and lower sulphur content to get a higher Mn: S ratio to reduce the ductile- brittle transition temperature by reasonable amount
Copper and copper alloys, such as bronze, brass, leaded brass are commonly used in friction parts of machines, as bearing liners, bushings, and water with gas fittings. Properties such as high strength and ductility, fatigue strength, wear resistance and machinability are necessary for these materials. Obtaining such properties is possible by creating submicrocrystalline and nanocrystalline structures in the materials [1]. The most common copper alloys are the brasses for which zinc, as a substitutional impurity, is the superior alloying element. Some of the common brasses are yellow, naval, and cartridge brass and gilding metal. Some of the common uses for brass alloys include jewelry, cartridge parts, automotive radiators, musical instruments,
However, filler metals are generally divided based on their working temperatures. Aluminum and aluminum alloys commonly brazed with filler metals that the working ...
The following equation shows how the molar mass of the metal can be approximated once the specific heat capacity is found:
Investigating the Resistance of a Wire We have been given the task to investigate the resistance of different wires, I am firstly going to start by explaining what resistance is, why it occurs, what causes it, and how it can be used to our advantages. Resistance is a term used to describe the property that various materials possess to restrict or inhibit the flow of electricity. Whether or not a material obeys Ohm's law, its resistance can be described in terms of its resistivity. The electrical resistance of a wire would be expected to be greater for a longer wire, less for a wire of larger cross sectional area, and would be expected to depend upon the material out of which the wire is made.
Iron is this starting point for steelmaking which has performed as a backbone to the advancement of modern technology and is vital to the upbringing of the future. It acts as the predominant reason for the industrial revolution. The foundation that is iron, more industrially known as Cast Iron has been given the second honour as it is the one of the cheapest materials for engineering, when taken to molten temperatures it gains the ability to be cast into intricate shapes. Cast Iron has been sub-divided into 5 different classes when the composition is changed or tampered with. Each of these classes have different properties but in comparison with Steel which also has its grades ranging from low to high grade carbon steel which are just alloys of purified iron with carbon and hints of other metal elements such as Manganese and Nickel so the production of Steel products differs only slightly from the commercial production of Iron. Steel which is the easily formed, cheap and yet strong and tough allowing for it to be extremely versatile creating products ranging from paperclips to reinforcing elements in the construction of buildings and skyscrapers.